Crater Lake National Park is one of the oldest parks in the United States, created in 1902 by President Theodore Roosevelt. The first lodge in
the park opened in 1915, and the Rim Drive around the lake gave the public easy
access to the entire lake in 1918. Soundings of the lake show it is
exceedingly deep, reaching as low as 1,943 feet (592 meters), making it the deepest lake in the United States. The lake is in the former caldera of Mount Mazama, which erupted around 7,700 years ago. Native American legends from the area include accounts of this eruption.
This Landsat 7 natural-color image of Crater Lake National Park shows the lake from an
unusual perspective: directly above. The deep blue of the lake waters dominates
the picture. In the western (left) side of the lake, the small island visible is
Wizard’s Island. Wizard Island is a cone that was rebuilt by volcanic processes in the mountain after the eruption that formed the caldera. Utlimately, the volcano became dormant, with no measured activity in the
past several thousand years. East of the lake, (a little south of 3 o’clock), is the other summit peak in the image, Mt. Scott,
which has just a trace of snow on its peak.
The rim wall of Crater Lake is a natural barrier over which no river reaches. All the water in the lake comes from rainfall or snow that fell directly into the crater and accumulated over time. The
only way water leaves the lake is through evapouration. Long rill-like features in grey and brown are the upper reaches of rivers which drain from the slopes of Mt. Scott. Rivers to the south and east drain into the Klamath River, while the strong grey features of larger streams to the west feed into the Rogue River. In this summer image, the deep green patches on the slopes
of the mountain are evergreen forests while paler green shows other vegetation such
as deciduous forest land. Outside the park, (for example, at the lower right corner) strong linear features show manmade
structures and property boundaries between different agricultural activities.
The data were collected by Landsat 7’s Enhanced Thematic Mapper Plus (ETM+)
instrument on August 17, 2000. The image was created by combining data from the
red, green, and blue channels (ETM+ bands 3, 2, and 1 respectively) to show a natural-color view.
NASA image created by Jesse Allen, Earth Observatory, using data obtained from the
University of Maryland’s Global
Land Cover Facility.
It one of the oldest parks in the United States, created in 1902 by President Theodore Roosevelt.
Crater Lake is formed from the caldera of Mount Mazama. Part of the Cascades volcanic chain, Mount Mazama sits between the Three Sisters volcanoes to the north and Mount Shasta to the south. The catastrophic eruption of Mount Mazama that occurred approximately 7,700 years ago destroyed the volcano while simultaneously forming the basin for Crater Lake. Eruptive activity continued in the region for perhaps a few hundred years after the major eruption. Evidence of this activity lingers in volcanic rocks, lava flows, and domes beneath the lake surface; the small cone of Wizard Island is the only visible portion of these younger rocks. Although considered a dormant volcano, Crater Lake is part of the United States Geological Survey Cascades Volcano Observatory seismic monitoring network.
Lake Jänisjärvi is a roughly oval-shaped lake, some 13 by 17 kilometers (8 by 11 miles) across, in northwestern Russia, near the Finnish border. The basin for this lake was formed hundreds of millions of years ago by a meteorite impact.
Crater Lake, a volcanic caldera in South Central Oregon’s Cascade Mountains, boasts breathtaking scenery, created about 7,700 years ago with the volcanic eruption and subsequent collapse of the summit of Mt. Mazama.